Centers for Disease Control and Prevention

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Preparing for a Mass Casualty Event: CDC and the American Red Cross encourage every organization, family and individual to take time to prepare for an emergency or disaster. These steps can help you get started.
Coping With a Traumatic Event: Information for Health Professionals
Tips for Coping With Stress: Mass tragedies, including school shootings, workplace violence, and community violence affect different people in different ways. People exposed to these situations can experience physical reactions, such as cuts and bruises, as well as mental reactions, such as frightening thoughts and painful feelings.